mod: cleanup TODO and outdated comments

examples/elements/scrollable.zig

@@ -56,7 +56,6 @@ const HelloWorldText = packed struct {
 pub fn main() !void {
     errdefer |err| log.err("Application Error: {any}", .{err});
 
-    // TODO maybe create own allocator as some sort of arena allocator to have consistent memory usage
     var gpa: std.heap.DebugAllocator(.{}) = .init;
     defer {
         const deinit_status = gpa.deinit();